A carrier is less stressful when it is familiar before the day you need it.
Leave it out
Keep the carrier open in a quiet room with familiar bedding so it becomes part of the environment.
Add positive associations
Place treats or toys nearby and gradually inside without forcing the cat to enter.
Practice closing the door briefly
Once the cat enters comfortably, close the door for a few seconds and reopen it before stress builds.
Practice short carries
Lift the carrier briefly, then progress to short car rides if travel is planned.
See Cat Essentials and Walk & Travel.